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Abstract

The measurement of dynamic tension in a moving tape or foil web has long been a problem, due to the difficulty of entering the moving system with sensitive instrumentation. The method described below allows a means of measurement using a proximity probe.

Country

United States

Language

English (United States)

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Measurement of Dynamic Tension in a Moving Foil Web

The measurement of dynamic tension in a moving tape or foil web has long
been a problem, due to the difficulty of entering the moving system with sensitive
instrumentation. The method described below allows a means of measurement
using a proximity probe.

It is known that there is a physical relationship between the tension in a tape
system and the height at which that tape flies above the surface of a pressurized
air bearing in the system path.

The capacitance probe distance meter is capable of measuring change in
tape height to an accuracy of 2-3 mu'', with a frequency response of 15-30 MHz.
The probe does not contact the tape. By using a properly calibrated probe, tape
tension is measured as an analog of tape height for any linear velocity.

The apparatus is shown in Fig. 1. The curves shown in Fig. 2 are the results
of tests conducted with this apparatus. They represent the measured
relationship between flying height and tape tension over a range of bearing
pressures. This system makes it possible to measure dynamic tension variations
at very high frequency without contacting the tape.